NOTE: Devices with iOS 9 and older are no longer supported and the Outlook app is not available to download. While older versions of Outlook will still work on devices running iOS 9, these devices will not get new app updates after build 2.48. Users can expect a degraded experience of the Outlook for iOS app over time, if they do not stay up-to-date. Microsoft only supports the two most recent OS release versions.

Depending on your version of the Outlook app and iOS, the instructions above (for iOS 10.x and 11.x) may work for you. If they don't, try the steps below.